CODEWITHSUNDEEP
apache-flexactionscript-3mxml
Yeti
Yeti

Reputation: 5818

Changing 'top' property at runtime in Flex

In the follow Canvas, how do I change the property top at runtime?

<canvas top="10"/>

I tried:

<canvas top="{ topVariable }"/>

But the binding doesn't seem to take effect. How can this be achieved?

Upvotes: 0

Views: 705

Answers (4)

xhuur
xhuur

Reputation: 103

The right way to do it is in did with SetStyle method (as CoreyDotCom show above) just do:

myCanvas.setStyle('top',[your own value])

But (there is always a "but") be careful with this way of use, notice that this line is could very expensive in performances issues, it initiate the object's renderering life cycle, which of course could make all its children to do it too and so on.

Hope it helps...

Upvotes: 1

Samuel Neff
Samuel Neff

Reputation: 74909

It sounds like your Canvas is embedded in something that already handles layout and thus will ignore top, like HBox or VBox. If that's the case then try setting padding on your container or nesting your Canvas inside another Canvas which will utilize the top setting.

Upvotes: 1

invertedSpear
invertedSpear

Reputation: 11054

Your example must be missing something. I built this quick application with the top value bound and it works just fine. Be sure you're not setting the X and Y (or really just the Y) properties as they would override the top style.

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" creationComplete="init();" borderStyle="none" borderColor="#000000" borderThickness="5">
    <mx:HSlider id="slider" x="10" y="463" minimum="0" maximum="100" snapInterval="10" enabled="true"/>
    <mx:Canvas width="200" height="200" borderStyle="solid" borderColor="#000000" borderThickness="3" top="{slider.value}">
    </mx:Canvas>

</mx:Application>

Upvotes: 2

user269785
user269785

Reputation:

If this is Flex 3, then myCanvas.setStyle("top", 10); (top is a style not an ActionScript property).

Upvotes: 4

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